DENVER — Several Colorado ski areas welcomed a record number of visitors over the Christmas and New Year's holidays. The Denver Post reported Thursday that Aspen Skiing Co. had some of its busiest days ever over the holiday season at its four resorts in the Roaring Fork Valley — Snowmass, Aspen Mountain, Aspen Highlands and Buttermilk. Aspen Skiing spokesman Jeff Hanle says there were 22,000 skiers on Dec.